William a



(No Model.)

.,W. A. ROBINSON.

SLIDE VALVE. v No. 388,374. Patented Aug. 21, 1888.

N. PETEns. mwuxrmgmpfwr. Washingiun. ILC.

l fh a m I m l A .wm E M 1... -w @l UNITED STATES WILLIAM A. ROBINSON, OF MEMPHIS, TENNESSEE, ASSIGNOR OF ONE-HALF TO JOHN E. RANDLE, OF SAME PLAGE. i

PATENT OFFICE..

SLI DE-VALVE.

SPECIFICATION forming part of Letters Patent No. 388,374, dated August 21, 1888. Application filed February 18, 18`88. Serial No.264,-179. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM A. ROBINSON, a citizen of the United States, residing at Memphis, in the county of Shelby and State of Tennessee, have invented certain new and useful Improvements in Slide-Valves for Steam and other Engines, of which the following is a full, clear, and exact specification.

Broadly, my invention relates' to that class 1o of valves known as balancedslide,7 but speciiically it has reference to steamchambers which are designed to be placed within the steam-chest to co-operate with or form a seat for the sliding valve. rr; Referring to the accompanying drawings, which form an important part of this application, Figure I represents a vertical longitudinal section of the cylinder and chest with the valve removed, showing my improved steamchambers, which is taken on the line m x, Fig. IV. Fig. II is a sectional plan showing the steam-passages in dotted lines,.taken on the line II II, Fig. IV. Fig. III is a transverse section of the end that is admitting pressure, taken on the line III III, Fig. I. Fig. IV is a similar section of the end that is exhausting, taken on the line IV IV, Fig. I. Fig. V is a side elevation of the slide-valve. Fig. VI is a perspective view of one of the steam-chambers- 1 represents the steam-cylinder, upon the top of which is secured in any customary manner an ordinary steam chest, 2. Situated within this steam-chest, at each end, are two Steamchambers, which are provided with ver- 3 5 tical and longitudinal faces 3 4, respectively. The faces 4 of said chambers rest upon the floor of the steam-chest, (or upon the top of the cylinder, as the case may be,) while the Vertical faces 3 form a passage-way at each end of 4o the chest, in which the slide-valves 5 travel, the inner ends of the faces 3 being elongated, as shown, so as to form a continuous bearing for the valves. Each of these steam-chambers are provided in their vertical faces 3 with steamports 6 7, which communicate through their lower faces, 4, with the steam ingress and exhaust ports 8 9, respectively, in the iioor of the chestleading into the cylinder. The valves 5 are formed 0f two solid blocks linked together by the bar l0, and which are provided with side cavities, 1l, of suflicient dimensions to barely span the two ports 6 7 in the steam` chambers, whereby when the valve is drawn to the extremity of its stroke, communication with the steam inthe chest will be cut off from the ports at one end by spanning both ports at each side of the valve at one end with the cavities 1l, which will permit the steam to eX- haust from the cylinder through the port 9 oa the port-s 6 7, the cavities ll, and port 8, while at the other end of the cylinder the valve is covering the exhaust-port 6 only and admitting live steam through the port 7 to the cylinder. f Asa means for taking up the wear caused by the valves sliding against the vertical faces 3 of the steam'chambers, I provide the longitudinal and vertical plates of the steam-chest with set-screws 12 13, respectively. The vertical screws 13` bear upon suitable elongated 7o bearings, 14, in the crown of the steam-chambers and hold them irmly against the floor of the chest, while the screws l2 bear in suitable cavitiesin the outer curved walls, 15, and serve to hold the steam-chambers snugly against the t valves. The great ad vantage of this arrangement will be readily understood to be the immediate access alorded to the steam-ch ambers for taking up wear and adjusting them to the valve while the engine is in motion, and thus avoid all danger caused by expansion and contraction of the parts where the engine has to be stopped, the steamchest opened, and the parts consequently allowed to cool, in addition t0 the advantage that a great amount of time and trouble is saved.

Havingthus described my invention, the following is what I claim as new therein and desire to secure by Letters Patentz' 'e 1. The combination, with the steam-chest having the ingress and exhaust ports, of the two steam-chambers located within said chest and at both ends and having vertical faces 3, elongated toward each other and arranged parallel with two ports therein communicating with the ports in the chest, respectively, and valves fitted between said elongated faces 3, connected together and having cavities 11 on both sides adapted to cover both ports in each face.

2.l The combination, with the steanrchest having ports 8 9 and the valve, of the steam- 5 chambers in said chest having ports 6 7, communicating with ports 9 8, respectively, and

setscrews bearing upon the tops and sides of wksaid steam-chambers, substantially as set forth.

"3;The combination, with the steainchest 1o having ports 8 9 and the slide-valve, of the steam-chambers in said chest, having ports 6 7, communicating with ports9 8, respectively,

and set-screws hearing upon the tops and sides of said chambers and projecting through the 1 5 plates of the chest, substantially as set forth.

WILLIAM A. ROBINSON.

Vitnesses:

R. P. GARY, 'f

H. Ik RHEA. 

